CCNA Routing and Switching Quiz

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Questions and Answers

What is the purpose of the 'ip dhcp excluded-address' command on a Cisco router?

  • To obtain IP parameters from a DHCPv4 server
  • To set up a relay agent for multiple UDP services
  • To configure the router as a DHCPv4 server
  • To exclude a range of IP addresses from being leased to DHCP clients (correct)

What is the result of a workstation sending a DHCPv6 INFORMATION-REQUEST message to a server?

  • The workstation is unable to obtain an IPv6 address
  • The workstation sends a request to multiple DHCPv6 servers
  • The workstation receives a list of available DHCPv6 servers
  • The workstation receives configuration information from the server (correct)

Which type of ACL is preferred when filtering packets coming from multiple inbound interfaces before they exit the interface?

  • Standard ACL
  • Outbound ACL (correct)
  • Inbound ACL
  • Extended ACL

What is the advantage of configuring a Cisco router as a relay agent?

<p>It can provide relay services for multiple UDP services (B)</p> Signup and view all the answers

What is the purpose of a standard ACL?

<p>To filter traffic based on source IP address only (C)</p> Signup and view all the answers

How many ACLs can be created and applied to a router with two interfaces that is routing both IPv4 and IPv6 traffic?

<p>8 (D)</p> Signup and view all the answers

What is the default behavior of untagged frames received on a trunk port?

<p>They are forwarded to the native VLAN only (A)</p> Signup and view all the answers

Which of the following statements is true about legacy inter-VLAN routing?

<p>It requires a separate Ethernet router link for each VLAN (C)</p> Signup and view all the answers

What is the purpose of ICMPv6 Route Advertisement (RA) messages in stateless DHCPv6?

<p>To allow clients to automatically assign IPv6 addresses to themselves (A)</p> Signup and view all the answers

What is required for a SOHO router to be connected to an ISP?

<p>It must be configured as a DHCPv4 client (C)</p> Signup and view all the answers

Which of the following statements is true about dynamic allocation of IPv6 addresses?

<p>It is not a commonly used allocation mechanism (A)</p> Signup and view all the answers

What message will a workstation send to obtain an IP address when it boots after an address lease has expired?

<p>DHCPDISCOVER (A)</p> Signup and view all the answers

Flashcards

ip dhcp excluded-address command purpose

Excludes a range of IP addresses from being assigned to DHCP clients.

DHCPv6 INFORMATION-REQUEST result

The workstation receives configuration information (e.g., DNS server, domain name) from the DHCPv6 server without obtaining an IPv6 address.

Preferred ACL for multiple inbound interfaces

Outbound ACLs are preferred for filtering packets exiting an interface, especially when those packets have arrived from multiple inbound interfaces.

Cisco router as relay agent advantage

A relay agent forwards DHCP requests between clients and servers on different networks, including other UDP services.

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Purpose of standard ACL

Filters network traffic based only on the source IP address.

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ACLs per router with IPv4/IPv6

A router with two interfaces routing both IPv4 and IPv6 traffic can have up to 8 ACLs (2 interfaces x 2 directions x 2 protocols).

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Untagged frames on a trunk port

Untagged frames are forwarded to the native VLAN configured on the trunk port.

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Legacy inter-VLAN routing

Legacy inter-VLAN routing requires a separate physical interface (and router link) for each VLAN to route traffic between them.

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ICMPv6 Route Advertisement (RA) purpose

Allow IPv6 clients to automatically configure their own IPv6 addresses using the network prefix and other information provided in the RA message.

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SOHO router connection to ISP

The SOHO router must function as a DHCPv4 client to obtain an IP address and other network settings from the ISP.

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Message to obtain IP after lease expiration

A workstation sends a DHCPDISCOVER message to locate available DHCP servers and request an IP address.

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Study Notes

Layer 2 and Layer 3 Addresses

  • FF-FF-FF-FF-FF-FF is the Layer 2 destination address for a broadcast
  • 255.255.255.255 is the Layer 3 destination address for a broadcast

Cisco Router Configuration

  • Configuring a Cisco router as a relay agent provides relay services for multiple UDP services
  • The command ip address dhcp configures the router to obtain IP parameters from a DHCPv4 server

DHCPv6

  • In stateless DHCPv6, a workstation sends a DHCPv6 INFORMATION-REQUEST message to a server for configuration information
  • Stateless DHCPv6 is a method for configuring IPv6 addresses on employee workstations
  • An administrator can configure a router to obtain IPv6 addresses using the command ipv6 address dhcp

ACL Placement

  • Inbound ACL placement is preferred when filtering packets from a single source
  • Outbound ACL placement is preferred when filtering packets from multiple sources before they exit an interface

Access Control Lists

  • The command ip dhcp excluded-address 10.0.15.1 10.0.15.15 excludes 15 IP addresses from being leased to DHCP clients
  • A standard ACL can be configured to allow only specific devices to access a network or resource
  • A single access list statement can match multiple networks (e.g. access-list 10 permit 192.168.16.0 0.0.3.255)
  • Up to 8 ACLs can be created and applied to a router with two interfaces (IPv4 and IPv6)

Network Configuration

  • An administrator can configure a standard ACL to allow devices on a specific network to access other networks
  • An ACL can be configured to deny traffic from a specific subnet to another subnet

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